Annotation queue endpoints; sandbox streaming executes

Observability and evaluations

Datasets and experiments

• Annotation queue item endpoints added for adding, listing, updating, deleting, counting, positioning, and reviewing run/thread queue items
• .csv/.jsonl uploads now work regardless of Content-Type browser reports; Windows Excel type issue fixed
• Evaluator lists show current name instead of historical name when renamed
• Metadata columns in experiment comparison grid now render values correctly
• Legacy endpoints marked as deprecated with Sunset date of January 31, 2027
• Dataset experiment tables can sort by feedback score with SmithDB queries enabled
• Annotation queue item APIs use project_id with session_id as alias
• Dataset example views restore proper spacing
• Pairwise annotation queues include tracing project ID when needed
• Evaluator score corrections now update immediately
• Configure Evaluator pane header/templates navigation background fixed in dark mode
• Dataset and run attachments resolve relative signed URLs in self-hosted deployments

Monitoring and alerting

• Added reusable ChartCard component to design system with standardized chart titles and layouts

Engine

• Resolved issues now return to Open when new matching trace linked
• Issue detail header renders category/tag badges on same line as title
• "Engine failed to complete a run" trigger removed from Slack/webhook configuration
• Engine run webhooks resolve API base from LANGSMITH_PUBLIC_API_ENDPOINT with fallbacks

Tracing

• Trace detail panes use elevated background matching section headers
• Bulk exports accept new opt-in feedbacks column with feedback entries as JSON
• Delete entire trace from run details actions menu
• Negative feedback-key filters work correctly with optimized ClickHouse tables
• Custom output renderers now offer Custom option alongside Markdown/Plain/JSON/YAML
• Tracing project activity/sorting stay up-to-date for self-hosted with Redis < 6.2
• POST /api/v1/runs/stats returns 404 for non-existent projects; reports client errors correctly
• Self-hosted deployments catch up missing tracing project last-run timestamps
• Run filters support token counts/costs across routed query backends
• Token Count/Cost filters default to total tokens/cost
• Threads/Traces/Runs switcher stays in sync when resetting views

Feedback

• Annotation queue item endpoints documented under /api/v1/platform
• PDFs and documents render in full-width preview frame

Prompts and playground

• Playground shows provider's error messages instead of generic server errors
• Playground batch/invoke endpoints sanitize run trees into JSON-safe payloads

Automations

• Forking evaluators now attaches copy to specified project/dataset

Deployment

• Create New Deployment form shows per-field validation messages
• Deleting tracing project with LangGraph deployment schedules cleanup
• Delete confirmation explains post-deletion database cleanup timing

Sandboxes

• New streaming execute request returns stdout/stderr as Server-Sent Events
• Sandboxes include langsmith CLI on PATH
• Sandbox/snapshot rows use single-column layouts with context menu actions
• Engine sandbox commands authenticate over WebSocket in self-hosted deployments
• langsmith CLI updated to v0.2.44 with /api path support

Administration

• LangSmith home page provides quick access to copy organization/workspace IDs
• Self-hosted OAuth/SSO MCP authorization endpoint 400 error fixed
• Self-hosted with online license shows monthly organization usage graph automatically
• Workspace/organization switching preserves page location
• Browser sessions refresh automatically before logout prompt

LLM Gateway

• Gateway policies with blank names show policy ID instead
• Gateway usage chart shows top 12 spenders; rest rolled into "Other"
• Home page onboarding includes Gateway Credits option
• Custom X-Gateway-* header condition works with organization/workspace/user-scoped policies
• Default spend cap/rate limit policies expand to show materialized sub-policies
• Gateway Credits purchase dialog shows credit balance and fee-inclusive total
• Enterprise organizations without Data Protection see greyed-out tab with access request link